Time-Resolved Observations of a Surface Domain Wall Distortions Induced by Torsion in Amorphous Glass-Coated Microwires

The amorphous glass-coated microwires are composite materials that have been extensively studied due to their very high domain wall (DW) velocities. Recently, it was shown that the apparent fast motion of DWs results from a specific tilting orientation, which is induced by high uniaxial mechanical stresses. While several models describe the internal spin structure of the DW, it remains unclear how the DW distorts at local defects and pinning sites. In this article, we present direct, time-resolved observations of DW distortion induced by mechanical torsion. The magneto-optical Kerr effect (MOKE) is used to investigate the interaction between mechanical torsion and surface deformation of the DW through direct time-resolved measurements.